CN101472316B

CN101472316B - Method for implementing voice call succession, interconnection functional entity

Info

Publication number: CN101472316B
Application number: CN2007100330478A
Authority: CN
Inventors: 吴晓波; 段小琴; 张戬; 李庆禹; 国炜; 朱文若
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-12-29
Filing date: 2007-12-29
Publication date: 2012-06-06
Anticipated expiration: 2027-12-29
Also published as: CN101472316A; WO2009092260A1

Abstract

The embodiment of the invention discloses a method for realizing voice calling continuity, an entity serving an interworking function and a terminal device, wherein, the method for realizing voice calling continuity comprises the following steps: The access of an IP network is achieved through the entity with the interworking function when a user is located under CS network; and CS voice conversation of the user, which is based on the voice load of IP network, is linked on core network bearer of the CS voice conversation of the user through the entity with an interworking function. The embodiment of the invention has the advantages that the voice calling continuity from the CS network to the IP network can be realized through the switching of the voice calling continuity of a single receiver.

Description

Realize the method and the interconnection functional entity of continuous voice call

Technical field

The present invention relates to moving communicating field, relate in particular to a kind of method, interconnection functional entity and terminal equipment of realizing continuous voice call.

Background technology

(Universal Mobile Telecommunications System is the 3-G (Generation Three mobile communication system) that adopts the WCDMA air interface technologies UMTS) to UMTS, also calls the WCDMA communication system to the UMTS system usually.The UMTS system has adopted and the similar structure of second generation GSM, comprise Radio Access Network (Radio Access Network, RAN) and core network (CoreNetwork, CN).Wherein Radio Access Network is used to handle all and wireless function associated, and CN handles functions such as customer location management in the UMTS system, service management and the exchange of realization and external network and routing function.CN from be divided in logic circuit commutative field (Circuit Switched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).(User Equipment UE) has constituted whole UMTS system together for UTRAN (Universal Terrestrial RadioAccess Network Universal Terrestrial Radio Access Network), CN and subscriber equipment.

In order to improve systematic function, system's architecture evolution (System ArchitectureEvo1ution, project SAE) are being carried out in the world at present.The framework of this system is as shown in Figure 1.Among Fig. 1, UE is subscriber equipment, i.e. terminal; EUTRAN is the wireless access network of evolution, and the Node B of evolution is wherein arranged, and is called ENB, possibly also have other nodes, and we replace these nodes with ENB.MME (Mobility ManagementEntity) is a Mobility Management Entity, has the chain of command function, as with the chain of command Message Processing of UE, mobile management (record UE positional information), paging, authentication etc.Serving SAE Gateway, gateway has user plane functions, transmits the data of UE, has S1-U interface with wireless access network.The similar altogether traditional SGSN of MME and gateway (Serving GPRS Support Node, Serving GPRS Support Node).PDN SAE Gateway, PDN (Packet Data Network, Packet Data Network) gateway; Similar traditional G GSN (Gateway GPRS Support Node; Gateway GPRS), there is the SGi interface, has functions such as strategy execution, packet filtering with outer data network.PCRF (Policy Control andCharging Rules Function) is policy control and charging regulation function entity, the implementation strategy controlled function of being correlated with.The S3 interface is the interface between the SGSN of MME and 2G/3G, and it is based on the GTP agreement, and S4 is the interface of gateway and SGSN.Gateway possibly be in same physical node with PDN Gateway also possibly be in different physical nodes.MME and gateway also possibly be same physical node or the physical node that separates.When top logic entity is in same node, then the interface signaling between it transfers internal node message to.

SAE/LTE is defined as a pure packet switching system, and this just is illustrated in this system speech business and can only in the carrying of packet switch, transmits.In the SAE/LTE system, the speech business data are generally controlled by IMS, so speech business is generally known as the VoIP speech business in SAE/LTE.And for traditional speech business, generally all be to be carried on the CS TDM (Time Division Multiplexing, time division multiplexing).SAE/LTE is that focus covers in the deployment of starting stage, and the GSM/UMTS network can be regarded a kind of all standing as to a certain extent.Obvious this network topology structure is brought a problem: when UE when 2G/3G CS network mobile gets into SAE/LTE network hotspot coverage; The speech business based on IMS of SAE/LTE need seamlessly be transferred in voice on the carrying 2G/3G CS network, promptly keeps voice continuity.

Continuous voice call (Voice Call Continuity; VCC) generally be meant; When UE was supporting the network that VoIP (Voice Over IP uses the IP transferring voice) is professional and do not support to move between the professional network of VoIP, it is continuous that the speech business of this UE must keep; The speech business that is about to be carried on the VoIP of origin system takes over seamlessly goal systems CS territory, and vice versa.Fig. 2 is the scheme principle schematic that existing employing Dual Radio (Dual Radio is meant generally that between 3GPP and Non-3GPP UE puts at one time and can accept two kinds of wireless signals simultaneously) realizes continuous voice call.

As shown in Figure 2, if UE A initiates audio call in the CS territory, this CS audio call is anchored at VCCAS (Voice Call Continuity Application Server VCC application server).Cover when UE A will move out the CS network and get into wlan network, UE A initiates an IMS audio call through wlan network and this IMS audio call also is anchored on the VCC AS.After this IMS audio call is set up, CS signaling between UE A and the VCC AS and voice bearer by the IMS signaling between UE A and the VCC AS with and attached voIP carry replace.Realized that from the continuous voice call of CS network to IMS network still, this scheme only is applicable between Wi-Fi network and the GERAN voice continuity problem under Dual Radio condition.Along with SAE/LTE; Wireless broad band technology such as WIMAX occur; Be necessary to consider solution from the seamless switching under Single Radio (Single Radio refers generally at 3GPP inner, and UE can only accept a kind of 3GPP wireless signal at a time point) situation between SAE/LTE, WIMAX and the cellular network.

Summary of the invention

Embodiment of the invention technical problem to be solved is; Method, interconnection functional entity and the terminal equipment of the borderline region of method, user's perception CS network and the IP network of the method that realizes continuous voice call is provided, realizing CS and PS business continuance can switch the continuous voice call of realization from the CS network to IP network through the single-receiver continuous voice call.

A kind of method that realizes continuous voice call that the embodiment of the invention provides from the CS network to IP network, this method comprises:

Set up the user to the logical channel between interconnection functional entity;

Said user is mutual based on said logical channel and said interconnection functional entity, registers at said IP network through said interconnection functional entity, consults the voice bearer data of said IP network;

Said user or said interconnection functional entity trigger said IP network and set up voice bearer according to said negotiation result;

When the mobile switching centre in the said CS network detected the voice switching that need carry out from said CS network to said IP network, said interconnection functional entity was from said mobile switching centre reception notification;

Or when the base station controller in the said CS network detects the voice switching that need carry out from said CS network to said IP network; Said user is from said base station controller reception notification, and said user notifies said interconnection functional entity through the unstructured supplementary data traffic logical channel;

Or said user notifies said interconnection functional entity with the metrical information of said IP network through said unstructured supplementary data traffic logical channel, determines whether that by said interconnection functional entity the voice that need carry out from said CS network to said IP network switch;

After said interconnection functional entity is confirmed to carry out the voice switching from said CS network to said IP network; Said interconnection functional entity triggers and carries out the switching based on said IP network, the voice bearer on the said interconnection functional entity is switched on the respective carrier network equipment of said IP network;

Said user inserts said IP network;

Said interconnection functional entity carries said user is associated with said user's CS voice conversation based on the CS voice conversation of the voice bearer of said IP network core net.

Accordingly, the another kind that the embodiment of the invention provides is realized the method for continuous voice call, and this method comprises:

When the user was in said CS network, said user inserted said IP network through interconnection functional entity;

Said user initiates that continuous voice call switches and said interconnection functional entity is initiated the switching based on said IP network, the IMS voice conversation that said user is switched at said IP network at the CS of said CS network voice conversation;

Said user inserts said IP network.

Want to answer that the embodiment of the invention provides the method for a kind of CS of realization and PS business continuance, this method comprises:

When the user was in the network of supporting CS and PS, said user inserted IP network through interconnection functional entity;

Said user initiates continuous voice call switching and the professional switching of PS; And said interconnection functional entity initiates the switching based on said IP network, the IMS voice conversation that said user is switched at said IP network at the CS of said CS network voice conversation and that said user is switched to said user in the PS of said CS network business is professional at the PS of said IP network;

Said user inserts said IP network.

Accordingly, the embodiment of the invention provides the method for the borderline region of a kind of user's perception CS network and IP network, and this method comprises:

When said user when the base station controller of said CS network receives the network identification information of said IP network, be judged to be the borderline region that said user gets into said CS network and said IP network;

Or when said user when the base station controller of said CS network receives the indication information of the borderline region that is used to indicate said user to get into said CS network and said IP network, be judged to be the borderline region that said user gets into CS network and said IP network.

Accordingly, the embodiment of the invention provides a kind of interconnection functional entity, and this interconnection functional entity comprises:

Receiving element is used to receive the signaling message that said user sends, and said signaling message sends to this interconnection functional entity through the logical channel of setting up between said user and this interconnection functional entity;

Agent unit is used for acting on behalf of the voice bearer data that said user registers and consults said IP network to said IP network according to the signaling message that said receiving element receives;

The unit is set up in carrying, is used for the negotiation result according to said agent unit, sets up voice bearer with said IP network;

Identifying unit; Be used for according to the notification message of mobile switching centre's transmission or the notification message of base station controller transmission; The information of perhaps sending according to the terminal is measured goal systems, switches to determine whether the voice that need carry out from said CS network to said IP network, wherein; When the mobile switching centre in the CS network detects the voice switching that need carry out from said CS network to said IP network, notify said interconnection functional entity; Or when the base station controller in the CS network detects the voice switching that need carry out from said CS network to said IP network, notifying said user, said user notifies said interconnection functional entity through said unstructured supplementary data traffic logical channel; Or said user notifies said interconnection functional entity with the metrical information of said IP network through said unstructured supplementary data traffic logical channel;

Switch unit; Be used for when said identifying unit judges that definite voice that need carry out from said CS network to said IP network switch; Triggering is also carried out the switching based on said IP network, the voice bearer on the said interconnection functional entity is switched on the respective carrier network equipment of said IP network;

Associative cell is used for said user is associated with based on the CS voice conversation of the voice bearer of said IP network the core net carrying of said user's CS voice conversation.

Accordingly, the embodiment of the invention provides another kind of interconnection functional entity, and this interconnection functional entity comprises:

Access unit is used for when the user is in the CS network, said user being inserted IP network;

Switch unit; Be used to receive said Client-initiated continuous voice call handoff request; Trigger switching and the call continuity also carried out based on said IP network and switch, the IMS voice conversation that said user is switched at said IP network at the CS of said CS network voice conversation.

Access unit is used for when the user is in the network of supporting CS and PS, said user being inserted IP network;

Switch unit; Be used to receive the professional handoff request of said Client-initiated continuous voice call handoff request and PS; Trigger and also to carry out based on the switching of said IP network and call continuity switches and PS is professional switches, the IMS voice conversation that said user is switched at said IP network at the CS of said CS network voice conversation and that said user is switched to said user in the PS of said CS network business is professional at the PS of said IP network.

Accordingly, the embodiment of the invention provides a kind of terminal equipment, and this terminal equipment comprises:

The registration support unit is used for setting up logical channel with interconnection functional entity, to register in said goal systems through said interconnection functional entity;

Switch unit; Be used for said registration support unit through said interconnection functional entity after said goal systems is accomplished registration; Initiate the single-receiver continuous voice call and switch, said terminal is switched to the voice conversation of said goal systems at the voice conversation of said origin system.

The subscriber equipment of the embodiment of the invention sends the signaling (for example registration, traffic signaling) of goal systems through interconnection functional entity; Thereby simulate of the behavior of said subscriber equipment, realized switching the purpose that realizes continuous voice call from the CS network to IP network through the single-receiver continuous voice call in goal systems.

Description of drawings

Fig. 1 is a kind of embodiment sketch map of the system architecture of System Architecture Evolution network;

Fig. 2 is that Fig. 2 is the scheme principle schematic that existing employing Dual Radio realizes continuous voice call;

Fig. 3 includes a kind of embodiment sketch map that interconnecting function is the network architecture of entity;

Fig. 4 is the network architecture sketch map with the direct-connected USSD of foundation passage of HLR;

Fig. 5 is the network architecture sketch map with the direct-connected USSD of foundation passage of MSC;

Fig. 6 is that the example structure of the IWF among Fig. 3 is formed sketch map;

Fig. 7 is that another example structure of the IWF among Fig. 3 is formed sketch map;

Fig. 8 is that another example structure of the IWF among Fig. 3 is formed sketch map;

Fig. 8 .a is that the example structure of the UE among Fig. 3 is formed sketch map;

Fig. 9 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 6;

Figure 10 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 7;

Figure 11 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 8;

Figure 12 to Figure 15 is that origin system is 2G (GSM), and goal systems is to realize under the network architecture of SAE/LTE that from origin system CS territory audio call is to the method sketch map of goal systems IMS territory continuous voice call;

Figure 16 is a method part sketch map of getting back to IMS territory audio call continuous voice call to the CS territory of 2G network from the SAE/LTE system;

Figure 17 is that origin system is that 2G or 3G (support double-transmission mode; Be that origin system had both supported CS professional; Support IP operation again), goal systems is to realize the part sketch map of audio call method of continuous voice call to goal systems IMS territory from origin system CS territory under the network architecture of SAE/LTE;

The origin system that Figure 18 to Figure 19 is based on Bi-casting (two broadcasting) is 2G (not supporting double-transmission mode), and goal systems is to realize the part sketch map of the method for continuous voice call under the network architecture of SAE/LTE;

Figure 20 is that origin system is 2G, and goal systems is to realize the part schematic flow sheet of another embodiment of the method for continuous voice call under the network architecture of SAE/LTE;

Figure 21 origin system is that 2G (supports double-transmission mode; Be that origin system had both supported CS professional; Support IP operation again) or 3G, goal systems is to realize the idiographic flow sketch map of audio call method of continuous voice call to goal systems IMS territory from origin system CS territory under the network architecture of SAE/LTE;

Figure 22 is that origin system is that 2G (supports double-transmission mode; Be that origin system had both supported CS professional; Support IP operation again) or 3G, goal systems is to realize the idiographic flow sketch map of audio call method of continuous voice call to origin system CS territory from goal systems IMS territory under the network architecture of SAE/LTE.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is done to describe in detail further below.

Fig. 3 is a kind of interconnection functional entity (Interworking Function, network architecture sketch map IWF) of including.As shown in Figure 3, this network comprises origin system, goal systems and interconnection functional entity.In concrete the realization, said origin system can be gsm system, WCDMA system, LTE system, WIMAX system and 3GPP2 system etc.; Said goal systems can be 3GPP2DO system, 3GPP21XRTT system, UMB system, SAE/LTE system, WIMAX system etc.; In concrete the realization, UE is established to the logical channel UP ' interface of IWF based on origin system.UE passes through the signaling (for example registration, traffic signaling) that UP ' interface sends goal systems, thereby simulation UE is in the behavior of goal systems.

In concrete the realization; UP ' interface can be based on the IP bearing system of origin system; Also can be based on the signaling level message of origin system (for example based on GSM USSD message, 2G/3G short message, 2G/3G/LTE NAS (None Access Stratum, non-access layer information) control messages.As shown in Figure 3, when origin system was gsm system, UE was established to the logical channel UP ' interface of IWF based on the USSD passage of origin system GSM.And then realizing the signaling (for example registration, traffic signaling) of UE through UP ' the interface transmission goal systems (systems such as 3GPP2DO system, 3GPP21XRTT system, UWB system, SAE/LTE system, WIMAX system) of USSD passage foundation, simulation UE is in the behavior of goal systems.UE and IWF directly adopt the ICCP based on USSD (IMS Control Channel Protocol IMS control channel agreement) of similar ICS (IMS Centralized System IMS centralized control system).

USSD (Unstructured Supplementary Service Data unstructured supplementary data traffic) is a kind of novel interactive sessions data service based on the GSM mobile communications network, is the another novel value-added service of on the GSM mobile communications network, releasing continue after the short message service.USSD is a kind of novel interactive data service based on the GSM network.What the USSD system adopted is towards connection, and the interactive session mode of transparent channel is provided, and is the ideal carrier of session service, has that response speed is fast, interaction capabilities strong, high reliability features, supports most of common GSM mobile handsets simultaneously.The form that USSD initiates: #SC*SI#, wherein, SC is a service code, is made up of the numeral of 0-9, SI is a business information, can be arbitrary content.The # of front is leading character (LeaderChar), can by (*, 1-3 bit combination #) forms, the # of back is that end mark (Close Char) is such as * 125#.Its framework has dual mode: with the direct-connected mode of HLR and with the direct-connected mode of MSC, Fig. 4 is the network architecture sketch map with the direct-connected USSD of foundation passage of HLR.As shown in Figure 4, under USSD center and situation that HLR docks, when issuing, the USSD center will send USSD message to the HLR that MS belonged to, and be transmitted to the MSC at this MS place by HLR, thereby USSD will be provided service for the USSD user that this HLR covered; MS is last when sending out, and USSD message arrives HLR via MSC, and HLR passes to the USSD center with it then, transmits USSD message by the USSD center and handles for corresponding service processing module (such as UssdServer, the Ussd server).Fig. 5 is the network architecture sketch map with the direct-connected USSD of foundation passage of MSC.As shown in Figure 5, under USSD center and situation that MSC docks, when issuing, the USSD center will send USSD message to the MSC at MS place, realize the whole network USSD user's automatic roaming (MSC at MS place must support the USSD function); MS is last when sending out, and USSD message will arrive the USSD center via MSC, be transmitted to the corresponding service processing module by the USSD center and handle, and this moment, the USSD center was as the UssdHandler (USSD processing center) of MSC.In addition, in concrete the realization, in order to improve the speed of UP ' interface command transmitting, UE and IWF pass through UP ' interface negotiation and launch compression function.

In concrete the realization, IWF can link to each other through Radius/Diameter and AAA (Autentication Authorization Accounting, authentication and authorization charging server) server.When goal systems was the 3GPP2DO network, IWF contained 3GPPDO and inserts the side entity function, and the interface of IWF and PDSN is A10/A11, and IWF and PCF interface are A8/A9/ (A14)/(A20).When goal systems was the 3GPP21XRTT network, IWF contained 3GPP21XRTT and inserts the side entity function, and the interface of IWF and 1XRTTMSC is A1.When goal systems was the UMB network, IWF contained UMB network insertion side entity function, and IWF and AGW interface are U1, and IWF and SRNC interface are U2, and IWF and eBS interface are U1.When goal systems was the SAE/LTE network, IWF contained SAE/LTE network insertion side eNodeB function, and IWF and MME interface are S1-MME, and IWF and Serving GW interface are S1-U.If IWF contains the SGSN/MME functional entity, correspondingly, IWF and MME have the S3/S10 interface.Perhaps the interface between IWF and the MME is S3 ', and when switching from the SAE/LTE network to the 2G/3G network, all switching message are all passed through IWF, and IWF is always on the path of S3 interface.When switching from the 2G/3G network to the SAE/LTE network, all switching message are all passed through IWF, and IWF is always on the path of S3 interface.When goal systems was the WIMAX network, IWF contained WIMAX network insertion side BS function, and IWF and ASN-GW interface are R4/R6.And, as the IWF of logical functional entity, can be carried on the actual physical equipment (such as, on the equipment such as MSC/SGSN/MME/ASN-GW).

Concrete, Fig. 6 is that the example structure of the IWF among Fig. 3 is formed sketch map, and is as shown in Figure 6; The IWF of present embodiment comprises access unit 40 and associative cell 50, and further, said access unit 40 comprises receiving element 401, agent unit 402, carries and set up unit 403 and access subunit 404; Further; Said access subunit 404 comprises identifying unit 4041 and switch unit 4042, wherein

Said receiving element 401 be used to receive the signaling message that said UE sends (such as; Register requirement; Service request etc.), the logical channel of said signaling message through setting up between said UE and this IWF (such as, when origin system is the GSM network; When goal systems is SAE/LTE, between UE and IWF based on the USSD passage) send to this IWF;

Said agent unit 402 is used for acting on behalf of the voice bearer data that said user registers and consults said IP network to said IP network according to the signaling message that said receiving element 401 receives;

Said carrying is set up unit 403 and is used for the negotiation result according to said agent unit 402, sets up voice bearer with said IP network; After said IWF and IP network were set up voice bearer, UE can insert the transmission that said IWF carries out the IP network signaling.

Said identifying unit 4041 is used to judge that the voice that whether need carry out from said CS network to said IP network switch; In concrete the realization, when the mobile switching centre in the said CS network detects the voice switching that need carry out from said CS network to said IP network, notify said interconnection functional entity; Or when the base station controller in the said CS network detects the voice switching that need carry out from said CS network to said IP network, notifying said user, said user notifies said interconnection functional entity through said unstructured supplementary data traffic logical channel; Or said user notifies said interconnection functional entity with the metrical information of said IP network through said unstructured supplementary data traffic logical channel, determines whether that by said interconnection functional entity the voice that need carry out from said CS network to said IP network switch; The notification message that 4041 notification messages according to the transmission of said mobile switching centre of this identifying unit, perhaps said base station controller send; The information of perhaps sending according to the terminal is measured goal systems, switches to determine whether the voice that need carry out from said CS network to said IP network.

Said switch unit 4042 is used for when said identifying unit judges that definite voice that need carry out from said CS network to said IP network switch; Triggering is also carried out the switching based on said IP network, the voice bearer on the said interconnection functional entity is switched on the respective carrier network equipment of said IP network.Such as; When origin system is the GSM network; When goal systems is the SAE/LTE network; IWF can trigger corresponding inter-eNB and switch (if target LTE sub-district belongs to different MME, then trigger inter-MME and switch), the voice bearer on the said interconnection functional entity is switched on the actual bearer equipment eNB and MME of target SAE/LTE network.

Said associative cell 50 is used for said user is associated with based on the CS voice conversation of the voice bearer of said IP network the core net carrying of said user's CS voice conversation.Such as, when origin system is the GSM network, when goal systems was the SAE/LTE network, the CS voice conversation that associative cell 50 can be associated with said user based on the eNB of SAE/LTE network and the CS voice conversation on the MME with UE was on the CS server is net loaded.So far, successfully UE is switched to the access bearer of IP based network based on the access bearer of CS network, follow-uply switch the IMS voice conversation that can said user's CS voice conversation be switched at said IP network when UE initiates continuous voice call.

Accordingly; Fig. 7 is that another example structure of the IWF among Fig. 3 is formed sketch map; As shown in Figure 7, the IWF of present embodiment comprises access unit 51 and switch unit 52, and further said access unit 51 comprises first receiving element 510 and agent unit 511; Said switch unit 52 comprises second receiving element 520, memory cell 521, first switch unit 522 and second switch unit 523; Further said first switch unit 522 comprises that identifying unit 5220 and first switches subelement 5221, wherein

Said first receiving element 510 is used to receive the signaling message that said user sends, and said signaling message sends to this interconnection functional entity through the logical channel of setting up between said user and this interconnection functional entity;

Said agent unit 511 is used for acting on behalf of said user to said IP network registration and to the IMS network registry according to the signaling message that said first receiving element receives.

Said second receiving element 520 is used for reaching behind said IMS network registry at said IP network as said user, receives said Client-initiated continuous voice call handoff request;

Said memory cell 521 is used for the demand signalling that said continuous voice call that said second receiving element 520 of buffer memory receives switches;

Said identifying unit 5220 is used to judge that the voice that whether need carry out from said CS network to said IP network switch, and this identifying unit 5220 is identical with identifying unit 4041 functions among the last embodiment, at this repeated description not;

The said first switching subelement 5221 is used in said triggering and carries out the switching based on said IP network, the voice bearer on the said interconnection functional entity is switched on the respective carrier network equipment of said IP network.

Second switch unit 523 is used for triggering and carry out follow-up continuous voice call according to said memory cell 521 stored calls continuity handoff request signalings and switches, the IMS voice conversation that said user is switched at said IP network at the CS of said CS network voice conversation.It is follow-up as long as the user inserts said IP network and can carry out voice conversation through IMS.

Accordingly, Fig. 8 is that another example structure of the IWF among Fig. 3 is formed sketch map, and as shown in Figure 8, the IWF of present embodiment comprises access unit 53, switch unit 54 and synchronous control unit 55, wherein,

Said access unit 53 is used for when the user is in the network of supporting CS and PS, said user being inserted IP network; In concrete the realization,, need PS business and the CS business of UE be switched to IP network simultaneously so when UE has the professional and CS business of PS simultaneously.

Said switch unit 54 is used to receive said Client-initiated continuous voice call handoff request and the professional handoff request of PS; Trigger and also to carry out based on the switching of said IP network and call continuity switches and PS is professional switches, the IMS voice conversation that said user is switched at said IP network at the CS of said CS network voice conversation and that said user is switched to said user in the PS of said CS network business is professional at the PS of said IP network.

Said synchronous control unit 55 is used to control the synchronous switching that said continuous voice call switches and the PS business is switched.

Accordingly, Fig. 8 .a is that the example structure of the UE among Fig. 3 is formed sketch map, and shown in Fig. 8 .a, the UE of present embodiment comprises perception unit 600, registration support unit 601 and switch unit 602, wherein,

Said perception unit 600 is used for being positioned at origin system when said terminal; And receive the network identification information of goal systems or receive when being used to indicate said user to get into the indication information of borderline region of said origin system and said goal systems; Judge that said terminal use gets into the borderline region of said origin system and said goal systems, and with the storage the domain identifier information updating be said network identification information or the indication information of receiving; In concrete the realization, several kinds of mode perception its entering LTE and 2G borderline regions below UE A can pass through.1) when UE receives adjacent LTE network of network information (for example LTE cell list, LTE frequency point information) from the BSC of 2G network, thereby judges that it gets into the LTE-2G borderline region; 2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE by BSC.In concrete the realization; Can send to UE through the BSC broadcast channel, perhaps through RRC message informing terminal (for example Cell Update Confirm cell update acknowledge message, Handover to UTRAN Command to switching command, Physical Channel Reconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, the Radio Bearer Setup radio bearer of UTRAN set up message, RRC Connection Setup Radio Link control connection is set up message such as message, Transport Channel Reconfiguration transmission channel reallocation message, Measurement Control) etc. send corresponding indication information to the terminal.Equally, UE A also can leave LTE and 2G borderline region through similar mode perception UE, gets into the 2G network coverage again.Concrete perceptive mode can comprise: 1) when UE when the LTE-2G/3G borderline region gets into 2G network (being non-LTE-2G borderline region), only receive the 2G network information (for example 2G cell tabulation) from BSC, thereby judge that it has left the LTE-2G/3G borderline region.2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE or dispose specific indication at non-LTE-2G borderline region BSC by BSC.In concrete the realization; Can send to UE through the BSC broadcast channel, perhaps through RRC message informing terminal (for example Cell Update Confirm cell update acknowledge message, Handover to UTRAN Command to switching command, Physical Channel Reconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, the Radio Bearer Setup radio bearer of UTRAN set up message, RRC Connection Setup Radio Link control connection is set up message such as message, Transport Channel Reconfiguration transmission channel reallocation message, Measurement Control) etc. send corresponding indication information to the terminal.The perhaps only specific indication of configuration on the BSC of LTE-2G borderline region, when UE gets into non-LTE-2G borderline region from the LTE-2G borderline region, when UE receives the indication of corresponding territory, then the UE perception its got into non-LTE-2G borderline region.

Said registration support unit 601 is used for setting up logical channel with interconnection functional entity, to register in said goal systems through said interconnection functional entity; In concrete the realization, UE is established to the logical channel UP ' interface of IWF based on origin system.UE passes through the signaling (for example registration, traffic signaling) that UP ' interface sends goal systems, thereby simulation UE is in the behavior of goal systems.In concrete the realization; UP ' interface can be based on the IP bearing system of origin system; Also can be based on the signaling level message of origin system (for example based on GSM USSD message, 2G/3G short message, 2G/3G/LTENAS (NoneAccess Stratum, non-access layer information) control messages.As shown in Figure 3, when origin system was gsm system, UE was established to the logical channel UP ' interface of IWF based on the USSD passage of origin system GSM.And then realizing the signaling (for example registration, traffic signaling) of UE through UP ' the interface transmission goal systems (systems such as 3GPP2DO system, 3GPP21XRTT system, UWB system, SAE/LTE system, WIMAX system) of USSD passage foundation, simulation UE is in the behavior of goal systems.UE and IWF directly adopt the ICCP based on USSD (IMS Control Channel Protocol IMS control channel agreement) of similar ICS (IMS Centralized System IMS centralized control system).

Said switch unit 602 be used for when said perception unit 600 perceive said terminal use get into said origin system and said goal systems borderline region and said registration support unit through said interconnection functional entity after said goal systems is accomplished registration; Initiate the single-receiver continuous voice call and switch, said terminal is switched to the voice conversation of said goal systems at the voice conversation of said origin system.

Accordingly, Fig. 9 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 6, and as shown in Figure 9, the method for present embodiment comprises:

Step S100 sets up the user to the logical channel between said interconnection functional entity; In concrete the realization, UE is established to the logical channel Up ' interface of IWF based on origin system.UE passes through the signaling (for example registration, traffic signaling) that Up ' interface sends goal systems, thereby simulation UE is in the behavior of goal systems.In concrete the realization, UP ' interface can be based on the IP bearing system of origin system, also can be based on the signaling level message of origin system (for example based on GSM USSD message, 2G/3G short message, 2G/3G/LTE NAS control messages.

Step S101, said user is mutual based on said logical channel and said interconnection functional entity, registers at said IP network through said interconnection functional entity, consults the voice bearer data of said IP network;

Step S102, said user or said interconnection functional entity trigger said IP network and set up voice bearer according to said negotiation result; In concrete the realization, after setting up voice bearer through IWF, IWF is for objective network virtual target network of network equipment (BSC or MME), is the pseudo-sub-district of CS network for the sub-district of the objective network under the source network IWF service.

Step S103, interconnection functional entity judge that the voice that whether need carry out from said CS network to said IP network switch, and after judging definite need the switching, execution in step S104; Otherwise, finish.In concrete the realization; Interconnection functional entity can confirm that the voice that need carry out from said CS network to said IP network switch through following mode; Such as; When the mobile switching centre in the said CS network detects the voice switching that need carry out from said CS network to said IP network, notify said interconnection functional entity; Or when the base station controller in the said CS network detects the voice switching that need carry out from said CS network to said IP network, notifying said user, said user notifies said interconnection functional entity through said unstructured supplementary data traffic logical channel; Or said user notifies said interconnection functional entity with the metrical information of said IP network through said unstructured supplementary data traffic logical channel, determines whether that by said interconnection functional entity the voice that need carry out from said CS network to said IP network switch;

Step S104, said interconnection functional entity trigger and carry out the switching based on said IP network, the voice bearer on the said interconnection functional entity are switched on the respective carrier network equipment of said IP network; Such as; When origin system is the GSM network; When goal systems is the SAE/LTE network; IWF can trigger corresponding inter-eNB and switch (if target LTE sub-district belongs to different MME, then trigger inter-MME and switch), the voice bearer on the said interconnection functional entity is switched on the actual bearer equipment eNB and MME of target SAE/LTE network.

Step S105, said user inserts said IP network.Such as, after accomplishing the inter-eNB switching, the user transfers to based on the voice bearer of IWF on the true eNB of said IP network, and at this moment, the user inserts said eNB and is accomplished to the access of said IP network.

Step S106, said interconnection functional entity carries said user is associated with said user's CS voice conversation based on the CS voice conversation of the voice bearer of said IP network core net.Such as, when origin system is the GSM network, when goal systems was the SAE/LTE network, the CS voice conversation that associative cell 50 can be associated with said user based on the eNB of SAE/LTE network and the CS voice conversation on the MME with UE was on the CS server is net loaded.

Step S107, said user initiate continuous voice call and switch, the IMS voice conversation that said user's CS voice conversation is switched at said IP network.

Certainly in concrete the realization; When said user or said interconnection functional entity trigger after said IP network sets up voice bearer according to said negotiation result; Said interconnection functional entity provides bearing resource from said IP network to said user is notified said user; Concrete, said interconnection functional entity can send to said user with said bearing resource information through said logical channel; Or said interconnection functional entity sends to said user through mobile switching centre and base station controller with said bearing resource information.

Want to answer that Figure 10 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 7, shown in figure 10, the method for present embodiment comprises:

Step S110 sets up said user to logical channel between said interconnection functional entity;

Step S111, said user is mutual based on said logical channel and said interconnection functional entity, reaches at the IMS network registry in said IP network registration through said interconnection functional entity;

Step S112, said user initiate continuous voice call and switch;

Step S113, the said user of said interconnection functional entity buffer memory initiate the signaling that continuous voice call switches;

Step S114, interconnection functional entity judge that the voice that whether need carry out from said CS network to said IP network switch, and after judging definite need the switching, execution in step S115; Otherwise, finish.In concrete the realization; Interconnection functional entity can confirm that the voice that need carry out from said CS network to said IP network switch through following mode; Such as; When the mobile switching centre in the said CS network detects the voice switching that need carry out from said CS network to said IP network, notify said interconnection functional entity; Or when the base station controller in the said CS network detects the voice switching that need carry out from said CS network to said IP network, notifying said user, said user notifies said interconnection functional entity through said unstructured supplementary data traffic logical channel; Or said user notifies said interconnection functional entity with the metrical information of said IP network through said unstructured supplementary data traffic logical channel, determines whether that by said interconnection functional entity the voice that need carry out from said CS network to said IP network switch;

Step S115, said interconnection functional entity triggers the switching based on said IP network, the voice bearer on the said interconnection functional entity is switched on the respective carrier network equipment of said IP network;

Step S116, said interconnection functional entity switches according to the continuous voice call of the continuous voice call hand off signaling triggering following of buffer memory, said user is switched to the IMS voice conversation of said IP network at the CS of said CS network voice conversation.

Step S117, said user inserts said IP network.

Accordingly, Figure 11 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 8, and shown in figure 11, the method for present embodiment comprises:

Step S120, said user inserts IP network through interconnection functional entity;

Step S121; Said user initiates continuous voice call switching and the professional switching of PS; And said interconnection functional entity initiates the switching based on said IP network, the IMS voice conversation that said user is switched at said IP network at the CS of said CS network voice conversation and that said user is switched to said user in the PS of said CS network business is professional at the PS of said IP network; In concrete the realization, said interconnection functional entity is controlled the synchronous switching that said continuous voice call switches and said PS is professional.

Step S122, said user inserts said IP network.

Be example with the specific embodiment below, the embodiment of the invention is described in more details.

Figure 12 to Figure 15 is that origin system is 2G (GSM); Goal systems is to realize under the network architecture of SAE/LTE that from origin system CS territory audio call is to the method sketch map of goal systems IMS territory continuous voice call, referring to figs 12 to Figure 15, when origin system is the GSM network; UE is established to the logical channel Up ' interface of IWF based on the USSD passage (adopting the direct-connected mode of HLR among the figure) of origin system GSM; When goal systems was the SAE/LTE network, IWF contained SAE/LTE network insertion side eNB (being BSC/eNodeB) function, IWF and MME (Mobility Management Entity; Mobility Management Entity) interface is S1-MME, and IWF and SAE GW interface are S1-U.The method idiographic flow of realizing audio call continuous voice call to goal systems IMS territory from origin system CS territory based on this network architecture is following:

Shown in figure 12, UE A initiates voice conversation through 2G CS network.If desired this CS audio call is switched to the IMS session based on the IMS network, then this audio call is anchored at VCC AS.It gets into LTE and 2G borderline region when UE A perception, and UE is established to the logical channel UP ' interface of IWF based on the USSD passage of origin system.Realize that UE adheres in the LTE territory through IWF.Carry out the LTE registration based on said UP ' interface then; Consult the voice bearer data of said LET network, and trigger the network based said negotiation result of said LTE by said UE or said IWF and set up voice bearer (voice bearer of setting up this moment is that IWF is to the voice bearer SAE GW).In concrete the realization, UE is established to the logical channel UP ' interface of IWF based on the USSD passage of origin system, realizes that UE is through any time of IWF after the step of adhering in LTE territory can advance to UE A start.In concrete the realization, several kinds of mode perception its entering LTE and 2G borderline regions below UE A can pass through.1) when UE receives adjacent LTE network of network information (for example LTE cell list, LTE frequency point information) from the BSC of 2G network, thereby judges that it gets into the LTE-2G borderline region; 2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE by BSC.In concrete the realization; Can send to UE through the BSC broadcast channel, perhaps through RRC message informing terminal (for example Cell Update Confirm cell update acknowledge message, Handover to UTRAN Command to switching command, Physical Channel Reconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, the Radio Bearer Setup radio bearer of UTRAN set up message, RRC Connection Setup Radio Link control connection is set up message such as message, Transport Channel Reconfiguration transmission channel reallocation message, Measurement Control) etc. send corresponding indication information to the terminal.Equally, UE A also can leave LTE and 2G borderline region through similar mode perception UE, gets into the 2G network coverage again.Concrete perceptive mode can comprise: 1) when UE when the LTE-2G/3G borderline region gets into 2G network (being non-LTE-2G borderline region), only receive the 2G network information (for example 2G cell tabulation) from BSC, thereby judge that it has left the LTE-2G/3G borderline region.2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE or dispose specific indication at non-LTE-2G borderline region BSC by BSC.In concrete the realization; Can send to UE through the BSC broadcast channel, perhaps through RRC message informing terminal (for example Cell Update Confirm cell update acknowledge message, Handover to UTRAN Command to switching command, Physical Channel Reconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, the Radio Bearer Setup radio bearer of UTRAN set up message, RRC Connection Setup Radio Link control connection is set up message such as message, Transport Channel Reconfiguration transmission channel reallocation message, Measurement Control) etc. send corresponding indication information to the terminal.The perhaps only specific indication of configuration on the BSC of LTE-2G borderline region, when UE gets into non-LTE-2G borderline region from the LTE-2G borderline region, when UE receives the indication of corresponding territory, then the UE perception its got into non-LTE-2G borderline region.

Shown in figure 13, when UE A continues then to trigger 2G and switch to LTE from the 2G network toward the LTE network mobile.Several kinds of modes below IWF at first passes through confirm that needing to trigger 2G-＞LTE switches: 1) do corresponding configuration at VMSC (visited mobile service center, vision location mobile switching centre), 2G-＞LTE is switched forwards to IWF.Particularly; From the 2G network; The LTE sub-district is by as serving pseudo-2G cell by IWF (function with goal systems BSC), and on the BSC/MSC of service UE the relevant routing iinformation in configuration LTE sub-district, make that (for example inter-BSC switches message to MSC with the switching message of 2G-＞LTE; If the BSC of IWF-BSC and UE current service belongs to different MS C, then trigger inter-MSC and switch) can be sent to IWF.2) UE A continues from the 2G/3G network toward the LTE network mobile, triggers 2G and switches to LTE, and the BSC discovery of service UE A need switch to the SAE/LTE network, and notice UE A (comprising target LTE sub-district ID), UE A pass through UP ' interface notice IWF.3) the UE A measurement report that will contain the LTE relevant information sends to IWF, whether will switch to goal systems SAE/LTE by the IWF decision.For the BSC system of UE A current service, UE can report corresponding measurement report simultaneously.This measurement report can comprise the LTE relevant information, also can not comprise the LTE relevant information.Then IWF triggers (as shown in Figure 7 based on the switching of said IP network; IWF triggers IWF and switches to actual eNB and the voice bearer between SAE GW to the voice bearer between SAE GW; IWF is according to the target LTE sub-district of decision; Trigger corresponding inter-eNB and switch (, then trigger inter-MME and switch), the voice bearer on the said interconnection functional entity is switched to the target eNB and the MME of the SAE/LTE network that consults if target LTE sub-district belongs to different MME; Target eNB is reserved Radio Resource), and said UE carried in the core net that the voice bearer of said IP network is associated with the CS voice conversation of said UE.And UE is associated with the CS voice conversation of said UE at the voice bearer of said IP network core net carried).IWF also can be with target LTE cell information in concrete the realization, and target eNB information notice UE A.In concrete the realization, IWF can be through any notice UE A in the following dual mode, 1) IWF passes through UP ' interface with the corresponding radio resource information of target eNB and sends to UE.2) IWF is encapsulated in inter-BSC or inter-MSC switching response message with the corresponding radio resource information of target eNB, sends to UE A through VMSC and BSC.

Shown in figure 14, UE A inserts the LTE Target cell, and said IWF is associated with said UE the CS voice conversation of said UE at the CS of said SAE/LTE network voice bearer core net is carried, and is about to SAE/LTE bearing association among Fig. 8 to the CS media plane.UP ' interface will be from transferring to goal systems SAE/LTE network based on origin system 2G system between UE A and the IWF, and in concrete the realization, the UP ' interface after the transfer can be based on the IP network of SAE/LTE system, also can be based on the NAS message of SAE/LTE network.At this moment, UE A is transferred to the access of the SAE/LTE of based target system network based on the access of 2G network.At this moment, IWF includes the MGW function, and conversion is based on speech coding and the IP-based speech coding of 2G CS.Perhaps the IP between IWF and the UE A is carried as IP tunnel (IP logical channel), the speech data that transmits between IWF and the UE A be encoded to speech coding based on 2G CS.

Shown in figure 15; If the UE decision switches to the IMS business platform; Then UE triggers Rel-7VCC DT process (the territory transfer process of Rel-7Voice Call Continuity Domain Transfer VCC version 7) the IMS business platform is transferred in the described voice of Fig. 8, switches thereby accomplish from the voice of CS-＞LTE.SAE/LTE shown in this moment carries and is released, and UP ' interface can be released, and also can continue to keep.Here whether UE switches to the IMS business platform according to the strategy decision of himself or network.Particularly, when UE A leaves the 2G-LTE borderline region, get into the LTE network internal, UE initiates above-mentioned VCC process.Judgment condition comprises following two kinds:

1) when UE when the LTE-2G/3G borderline region gets into LTE network (being non-LTE-2G borderline region), only receive the LTE network information (for example LTE cell list, LTE frequency point information) from eNodeB, thereby judge that it has left the LTE-2G/3G borderline region.

2) on the eNodeB of LTE-2G borderline region, dispose specific indication, and send to this regional UE, perhaps in the specific indication of non-LTE-2G borderline region eNodeB configuration by eNodeB.In concrete the realization; Can send to UE through the eNodeB broadcast channel, perhaps through RRC message informing terminal (for example Cell Update Confirm cell update acknowledge message, Handover to UTRAN Command to switching command, Physical Channel Reconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, the Radio Bearer Setup radio bearer of UTRAN set up message, RRC Connection Setup Radio Link control connection is set up message such as message, Transport Channel Reconfiguration transmission channel reallocation message, Measurement Control) etc. send corresponding indication information to the terminal.The perhaps only specific indication of configuration on the eNodeB of LTE-2G borderline region, when UE gets into non-LTE-2G borderline region from the LTE-2G borderline region, when UE receives the indication of corresponding territory, then the UE perception its got into non-LTE-2G borderline region.

Certainly; In concrete the realization, after the user moves into goal systems SAE/LTE, also possibly come back to origin system 2G network; Shown in figure 16; If UE decision switches to state shown in Figure 14 again, if this moment UE and IWF between UP ' interface do not exist, then UE triggers UP ' interface and rebulids process.And then, UE and IWF negotiating bearer parameter.According to the bearing parameter that consults, IWF triggers the SAE/LTE dedicated bearer through Rx interface and sets up process or UE A initiation SAE/LTE loading establishing process.Then; Trigger Rel-7 VCC DT process (the territory transfer process of Rel-7Voice Call Continuity Domain Transfer VCC version 7) and convert the IMS speech business to Figure 14 described speech business; Further, can trigger inter-BSC or inter-MSC switches and will arrive the state based on Figure 12 based on the described state exchange of Figure 14.Here, whether UE can switch the IMS business according to the strategy decision of himself or network.IWF is to the correlation step among the similar Figure 14 of the processing of the user plane of speech business.In addition, the above-mentioned flow process that Figure 16 is described is equally applicable to initiate the session of an IMS initial speech at SAE/LTE.

In addition; The foundation of USSD logical channel in the above-mentioned flow process, through the USSD logical channel in the SAE/LTE registration process, can occur in UE any one stage after the start of 2G network through USSD logical channel negotiating bearer parameter and at the loading establishing process of SAE/LTE, and be not limited to the time point in the above embodiments.Equally, the USSD logical channel is to be transmitted to IWF then through HLR in the foregoing description, just provide here a kind of maybe USSD logical channel path, do not limit the path (for example USSD logical channel maybe directly from VMSC to IWF) of USSD.For example when UE gets into the 2G-LTE borderline region; UE sets up the USSD logical channel; In SAE/LTE registration, through USSD logical channel negotiating bearer parameter and set up SAE/LTE and carry, wait for the arrival of 2G-＞LTE switching time through the USSD logical channel then.Especially,, can perhaps dispose corresponding network strategy indication UE after the GSM start by static mobile phone strategy, carry out some or all of operation based on the USSD logical channel in order to dwindle the switching time of whole C S-＞LTE.

It is WIMAX network, 3GPP2HRPD network, 3GPP2 UMB network and 3GPP21XRTT network that present embodiment is equally applicable to goal systems.

Figure 17 is that origin system is that 2G or 3G (support double-transmission mode; Be that origin system had both supported CS professional; Support IP operation again), goal systems is to realize the part sketch map of audio call method of continuous voice call to goal systems IMS territory from origin system CS territory under the network architecture of SAE/LTE, with reference to Figure 17; Flow process under this network architecture and Figure 12 are similar to embodiment shown in Figure 15, difference be following some:

Shown in figure 17,1) for the 2G network, UP ' interface can be based on 2G PS network or 2G NAS layer message; For 3G network, UP ' interface can be based on 3G PS network or 3G NAS layer message.Wherein UE A is different through selected SAE GW in the 2G/3G network attachment process with UE A through IWF selected SAE GW in goal systems SAE/LTE attaching process.

2), need PS business and the CS business of UE be switched to the SAE/LTE network simultaneously so if UE has the professional and CS business of PS simultaneously.At this moment; IWF contains MME or SGSN functional entity; And dispose corresponding data so that 2G/3G is sent to IWF to LTE PS handoff request at the BSC/SGSN of service UE; IWF according to 2G/3G to the PS of LTE switch the synchronous 2G/3G of sync bit in switching to the CS of LTE with 2G/3G to the PS handoff request of LTE and 2G/3G to the CS handoff request of LTE, require the SAE/LTE goal systems to reserve corresponding resource.Simultaneously, IWF generates the CS switching response message of 2G/3G to the PS switching response message of LTE and 2G/3G to LTE, and in described response message the synchronous indicating bit of interpolation, be transmitted to UE through the SGSN/VMSC/BSC that serves this UIE then.Here, IWF also can pass through UP ' interface and sends corresponding handoff response and give UE.

When goal systems was the WIMAX network, the carrying that UE A passes through UP ' interface, IWF sets up non-voice service at target WIMAX network was responsible for triggering and control 2G/3G-＞WIMAX handoff procedure (comprising that voice bearer and non-voice carry) by IWF.It is 3GPP2HRPD network, 3GPP2UMB network that said process is equally applicable to goal systems.

The origin system that Figure 18 to Figure 19 is based on Bi-easting (two broadcasting) is 2G (not supporting double-transmission mode), and goal systems is to realize the part sketch map of the method for continuous voice call under the network architecture of SAE/LTE.

Shown in figure 18, UE A initiates voice conversation through 2G CS network, and this audio call is anchored at VCC AS.It gets into the borderline region of LTE network and 2G network when UE A perception; UE A adheres in the LTE territory through IWF; The similar Figure 12 of its attaching process is to embodiment shown in Figure 15, and UE A passes through UP ' interface, IWF and SAE/LTE network in IMS network completion IMS registration process then.

Further, UE A triggers Rel-7 VCC DT process after accomplishing the IMS registration process, set up professional control of new IMS and IMS user plane.After Rel-7VCC DT process is accomplished; CS control plane and CS user plane based on 2G CS speech business still are held; Simultaneously, VCC MGW launches and two broadcasts (Bi-easting), and promptly VCC MGW sends speech data to IMS user plane and CS user plane simultaneously simultaneously.When UE A from the 2G/3G network when the LTE network mobile, trigger 2G and switch and notice IWF (method of notice IWF and Fig. 6 extremely shown in Figure 9 embodiment similar) to LTE.IWF triggers the switching based on the LTE network; It is the inter-eNB/inter-MME switching flow among the IWF triggering figure; Thereby IWF is switched to the voice bearer of eNB to SAE GW to the voice bearer of SAE GW, and the voice bearer that is about on the IWF switches on the LTE network, and UE A inserts objective network LTE.

Perhaps, shown in figure 19, at step S1300, UE A continues from the 2G/3G network toward the LTE network mobile, triggers switching and the notice IWF (method and Figure 12 of notice IWF to shown in Figure 15 embodiment similar) of 2G to LTE.IWF notice UE A carries out Rel-7VCC DT process, sets up professional control of new IMS and IMS user plane (being the process of setting up of SAE/LTE voice dedicated bearer).After the IMS user plane was set up successfully, inter-eNB or inter-MME that IWF is triggered to target SAE/LTE switched, and its flow process is identical to embodiment shown in Figure 15 with Figure 12.Its detailed process is as follows:

When IWF receives inter-eNB or inter-MME switching response message, the corresponding message of IWF temporary cache.

After receiving Rel-7VCC DT process completion message (for example UE sends to the ACK message of VCC AS); IWF just transmits inter-eNB or the inter-MME switching response message is given UE (idiographic flow and Figure 12 are similar to embodiment shown in Figure 15), and UE is linked into target SAE/LTE network according to the switching command that receives.

Perhaps UE is after receiving switching command, and UE waits for after Rel-7VCC DT process is accomplished and just begins to insert goal systems (for example UE sends to the ACK message of VCC AS).

Perhaps, shown in figure 18, UE A continues from the 2G/3G network toward the LTE network mobile; UE A triggers Rel-7VCC DT process after accomplishing registration process, UE A sends invite (VDI) message; Wherein VDI is VCC Domain Transfer URI, and the conversion of VCC territory is unified to indicate.The corresponding invite of IWF temporary cache (VDI) message, this moment, the call control timer on the UE was provided in that not receive call (such as 180Ring/200 OK) not overtime yet.When 2G is triggered to the switching of LTE, and this 2G of IWF perception is to the handoff procedure of LTE (method of notice IWF and Figure 12 extremely shown in Figure 15 embodiment similar).IWF carries out Rel-7VCC DT process immediately, sets up professional control of new IMS and IMS user plane (being the process of setting up of SAE/LTE voice dedicated bearer).And IWF triggers inter-eNB or inter-MME switching that IWF is triggered to target SAE/LTE, and its flow process is identical to embodiment shown in Figure 15 with Figure 12.Its detailed process is as follows:

After receiving Rel-7VCC DT process completion message (for example UE sends to the ACK message of VCC AS); IWF just transmits inter-eNB or the inter-MME switching response message is given UE (idiographic flow and Fig. 6 are similar to embodiment shown in Figure 9), and UE is linked into target SAE/LTE network according to the switching command that receives.

When UE A in the process that moves, cause the variation of IWF owing to the band of position changes, then UE A send message give old IWF indication its discharge invite (VDI), and UE A resends invite (VDI) and arrives new IWF.

Said process also is fit to the switching situation of LTE to CS; Be that UE A uses IMS network operation speech business at the LTE network; When UE A entering LTE and zone, 2G border, UE A in 2G CS network registration process, triggers Rel-7VCC DT process through IWF; Set up professional control of new CS and CS user plane, its idiographic flow is similar in the present embodiment CS to the handoff procedure of LTE.

Further; Origin system based on Bi-easting (two broadcasting) is 2G (a support double-transmission mode); Goal systems is to realize under the network architecture of SAE/LTE that the method for continuous voice call can be through BSC does configuration in the source; When taking place 2G to the switching of LTE, only to source SGSN transmission handoff request, source SGSN does corresponding configuration 2G-＞LTE PS handoff request is sent to IWF-MME/SGSN source BSC.IWF triggers inter-MME and switches perhaps inter-eNodeB switching (this switching message comprises the non-voice class context of 2G-＞LTE PS switching and the voice class context that 2G-＞LTE CS switches) after receiving 2G-＞LTE PS switching message.Its flow and embodiment shown in Figure 180 are similar, at this, no longer are described in detail.

Further, Figure 20 is that origin system is 2G, and goal systems is to realize under the network architecture of SAE/LTE that voice contact calls out the part schematic flow sheet of another embodiment of the method for property.Shown in figure 20; Perhaps UE A need initiate voice conversation after UE A start; Set up the USSD logical channel, through the USSD logical channel in the SAE/LTE registration process, through USSD logical channel IMS registration process, initiate IMS audio call process through the USSD logical channel.In initiating IMS audio call process, IWF distributes CS domain routing number, and passes through UP ' interface and send UE A to.UE A initiates CS audio call process (called number is said CS domain routing number) according to said CS domain routing number.The said CS domain routing number of 2G CS network analysis is to IWF, thereby the CS that sets up from UE A to IWF carries.IWF is responsible for related CS carrying and the IP from SAE GW to IWF-eNB from UE A to IWF and carries.Follow-up 2G-＞LTE switching flow and SR-VCC process are similar to Figure 12 to embodiment shown in Figure 15, no longer are described in detail at this.

Same present embodiment is applicable to that origin system is a 3G network, and goal systems is WIMAX network, 3GPP2HRPD network, 3GPP2UMB network and 3GPP21XRTT network.

Figure 21 is that origin system is that 2G (supports double-transmission mode; Be that origin system had both supported CS professional; Support IP operation again) or 3G, goal systems is to realize the idiographic flow sketch map of audio call embodiment of the method for continuous voice call to goal systems IMS territory from origin system CS territory under the network architecture of SAE/LTE; Shown in figure 21, the method for present embodiment specifically comprises:

Step S1, the SR-VCC preparatory stage:

When UE has the CS of an activity to call out and is in the SR-VCC territory, UE is in the SR-VCC preparatory stage.The SR-VCC territory here is similar to the LTE-2G borderline region of Figure 12 to the embodiment shown in Figure 15.Particularly, carry out following flow process in the SR-VCC stage:

At step S10, UE initiates voice conversation through 2G CS network, and this audio call is anchored at VCC AS (not drawing among the figure).

At step S11; When UE A perception gets into LTE and 2G borderline region; UE adheres in the LTE territory through IWF, and the similar Figure 12 of its process and method is to embodiment shown in Figure 15, and UE A passes through UP ' interface, IWF and SAE/LTE network in IMS network completion IMS registration process then.

At step S 12, UE initiates Invite (VDI), and IWF is with Invite (VDI) buffer memory.

Step S2, the territory transition region:

Switch when UE has the CS of an activity to call out and is in the SR-VCC territory and 2G-＞LTE takes place this moment, UE is in the territory transition region.Particularly, transition region is carried out following flow process in the territory:

At step S21-S23, the BSC in the 2G network judges whether decision triggers the switching flow of 2G to LTE.

At step S24-S27, IWF is after receiving handoff request, and the Invite (VDI) with buffer memory sends CSCF (Call Session Call Function, call session control module) at once, thereby triggers territory transfer process and LTE network-specific loading establishing process.

At step S28, the LTE network is set up voice bearer.

At step S29, if IWF sends handoff request to the LTE network. 2G network support DTM and this moment have movable PS professional, and then this moment, 2G network B SC judged, decision triggers DTM and switches.Because IWF in the S3 signaling paths, need pass through IWF so PS switches message between SGSN and MME.If IWF accepts 2G-＞LTE PS handoff request that 2G SGSN sends over earlier, then IWF checks at first whether this 2G-＞LTE PS handoff request has the CS indicating bit.If the CS indicating bit is arranged, then the IWF perception this switch to DTM and switch, IWF waits for 2G-＞LTE CS handoff request, thus synchronously with the unified inter-eNodeB handoff request of generation.This moment, IWF sent CSCF (Call Session Call Function call session control module) with buffer memory Invite (VDI) at once, thereby triggered territory transfer process and LTE network-specific loading establishing process.When UE receives 2G-＞LTE CS handoff request, IWF carries out follow-up switching flow.If IWF accepts 2G-＞LTE CS handoff request that 2G MSC sends over earlier, then IWF checks at first whether this 2G-＞LTE CS handoff request has the PS indicating bit.If the PS indicating bit is arranged, then the IWF perception this switch to DTM and switch, IWF waits for 2G-＞LTE PS handoff request, thus synchronously with the unified inter-eNodeB handoff request of generation.This moment, IWF sent CSCF (Call Session Call Function call session control module) with buffer memory Invite (VDI) at once, thereby triggered territory transfer process and LTE network-specific loading establishing process.When UE receives 2G-＞LTE PS handoff request, IWF carries out follow-up switching flow.

At step S210, DTF (Domain Transfer Function territory modular converter) processing domain flow path switch.

At step S211, IWF receives that target LTE network sends the switching request response of returning.

At step S212, IWF sends handoff response and gives MSC.If DTM switches, then IWF will receive handoff response from the LTE network and be divided into 2G-＞LTE PS HO response and respond with 2G-＞LTE CS HO, send to SGSN and MSC respectively.

At step S213-215, MSC sends corresponding switching command and gives UE, and UE inserts target LTE network.

Step S3, the SR-VCC preparatory stage discharges:

When the CS of UE end of calling or UE are in non-SR-VCC territory, UE is in the SR-VCC preparatory stage and discharges.Particularly, the SR-VCC preparatory stage release stage is carried out following operation:

At step S31, UE sends Cancel message and gives IWF, and IWF deletes corresponding UE state.

It is WIMAX network, 3GPP2HRPD network, 3GPP2 UMB network and 3GPP21XRTT network that present embodiment is equally applicable to objective network.The relevant DTM switching flow of this embodiment is applicable to all embodiment, equally also is suitable for 3G network.

Figure 22 is that origin system is that 2G (supports double-transmission mode; Be that origin system had both supported CS professional; Support IP operation again) or 3G, goal systems is to realize the idiographic flow sketch map of audio call embodiment of the method for continuous voice call to origin system CS territory from goal systems IMS territory under the network architecture of SAE/LTE; Shown in figure 22, the method for present embodiment comprises:

Step S6, the SR-VCC preparatory stage:

When UE has the IMS of an activity to call out and is in the SR-VCC territory, UE is in the SR-VCC preparatory stage.The SR-VCC territory here is similar to the LTE-2G borderline region among the embodiment 1.Particularly, the SR-VCC preparatory stage is carried out following flow process:

At step S61, UE initiates voice conversation through the SAE/LTE network, and this audio call is anchored at VCCAS.

At step S62, when UE A perception entering LTE and 2G borderline region, UE is through IWF registration in the CS territory, 24.008 message, its process and the method similar embodiment 1 of being correlated with through NAS (Non Access Stratum non-access layer information) transmission between UE and the IWF.

At step S63, UE initiates Setup (VDN), and IWF is with Setup (VDN) buffer memory.

In concrete the realization, UE just can send CM Service Request (Confirm Mode Service Request, affirmation mode business request information) to MSC after after registration, thus the negotiations process of the authentication of triggering following.The CM Service Request that this moment, IWF buffer memory UE sent.When MSC does not receive Setup message for a long time, the MM of MSC (Mobility Management mobile management) timer expiry, thus MSC triggers unusual flow process, when notice IWF discharges corresponding resource.If IWF still preserves the SR-VCC correlation behavior of UE, then IWF resends CM Service Request message, perhaps notifies UE to resend CMService Request message.Perhaps for the UE of SR-VCC, UE periodically send CM Service Request, thereby the MM state that guarantees MSC can be not overtime according to the configuration of self.

Step S7, the territory transition region:

Switch when UE has the IMD of an activity to call out and is in the SR-VCC territory and LTE-＞2G/3G takes place this moment, UE is in the territory transition region.Particularly, the territory transition region is carried out following flow process:

At step S71-S73, LTE network eNodeB judges that decision triggers LTE-＞2G/3G switching flow.

At step S74, IWF sends to the CS core net with buffer memory Setup (VDN) at once after receiving handoff request.

At step S75-S76, RAB (Radio Access Bearer, RAB) appointment process.。If [in order to reduce service outage duration, IWF triggers the voice dedicated bearer through Rx interface and sets up, and its process is similar to shown in Figure 12.]

At step S77, IWF sends handoff request to the 2G/3G network, judges to comprise IMS speech business and non-voice service, and decision triggers DTM and switches.Because IWF in the S3 signaling paths, need pass through IWF so PS switches message between SGSN and MME, the synchronous whole flow process of IWF, its process is similar to the embodiment of Figure 15.

At step S78-S710, trigger the territory transfer process.

At step S711, DTF (Domain Transfer Function, territory modular converter) processing domain flow path switch.If in order to reduce service outage duration, VCC AS triggers two broadcasting, its process is similar to shown in Figure 180.

At step S712, IWF receives switching command.

At step S713, IWF transmits handoff response and gives MME.

At step S714-S716, MSC sends corresponding switching command and gives UE, and UE inserts target LTE network.

At step S717, if Connect message does not send to UE through the LTE network, then MSC sends this message through the 2G/3G network and gives UE.

Step S8, the SR-VCC preparatory stage discharges:

At step S81, UE sends DISCONNECT message and gives IWF, and IWF deletes corresponding UE state.

Above disclosedly be merely preferred embodiment of the present invention, can not limit the present invention's interest field certainly with this, the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.

Claims

1. a method that realizes continuous voice call is characterized in that, comprising:

Said user is mutual based on said logical channel and said interconnection functional entity, registers at IP network through said interconnection functional entity, consults the voice bearer data of said IP network;

When the mobile switching centre in the CS network detected the voice switching that need carry out from said CS network to said IP network, said interconnection functional entity was from said mobile switching centre reception notification;

Said user inserts said IP network;

2. the method for realization continuous voice call as claimed in claim 1; It is characterized in that; After said interconnection functional entity is associated with said user said user's CS voice conversation based on the CS voice conversation of the voice bearer of said IP network core net is carried, also comprise:

Said user initiates continuous voice call switches, the IMS voice conversation that said user is switched at said IP network at the CS of said IP network voice conversation.

3. the method for realization continuous voice call as claimed in claim 1 is characterized in that, described logical channel is unstructured supplementary data traffic passage, short message passage or non-access layer information passage.

4. the method for realization continuous voice call as claimed in claim 1 is characterized in that, triggers said IP network at said user or said interconnection functional entity and also comprises after setting up voice bearer according to said negotiation result:

Said interconnection functional entity sends to said user through said logical channel with bearing resource information;

Or said interconnection functional entity sends to said user through mobile switching centre and base station controller with said bearing resource information.

5. the method for realization continuous voice call as claimed in claim 1; It is characterized in that; Said user inserts said IP network, and said interconnection functional entity is associated with the step that the core net of said user's CS voice conversation carries with said user and also comprises at the voice bearer of said IP network:

Logical channel based on said CS network between said user and said interconnection functional entity is switched to the logical channel based on said IP network.

6. the method for realization continuous voice call as claimed in claim 1 is characterized in that:

When said user was in the borderline region of said CS network and said IP network, said user inserted said IP network through interconnection functional entity.

7. the method for realization continuous voice call as claimed in claim 1; It is characterized in that; When it gets into the borderline region of CS network and IP network when said user's perception; Set up the logical channel of said user to interconnection functional entity: wherein, its mode that gets into the borderline region of CS network and IP network of user's perception comprises:

8. the method for realization continuous voice call as claimed in claim 7 is characterized in that, the mode that the indication information that said base station controller gets into the borderline region of said CS network and said IP network with the said user of said indication sends to said user is:

Send through broadcast;

Perhaps send through RRC message.

9. an interconnection functional entity is characterized in that, comprising:

Receiving element is used to receive the signaling message that the user sends, and said signaling message sends to this interconnection functional entity through the logical channel of setting up between user and this interconnection functional entity;

Agent unit is used for acting on behalf of the voice bearer data that said user registers and consults said IP network to IP network according to the signaling message that said receiving element receives;

Identifying unit; Be used for according to the notification message of mobile switching centre's transmission or the notification message of base station controller transmission; The information of perhaps sending according to the terminal is measured goal systems, switches to determine whether the voice that need carry out from the CS network to said IP network, wherein; When the mobile switching centre in the CS network detects the voice switching that need carry out from said CS network to said IP network, notify said interconnection functional entity; Or when the base station controller in the CS network detects the voice switching that need carry out from said CS network to said IP network, notifying said user, said user notifies said interconnection functional entity through the unstructured supplementary data traffic logical channel; Or said user notifies said interconnection functional entity with the metrical information of said IP network through said unstructured supplementary data traffic logical channel;